Sure! Here's an example of an HTML file that implements the game you described using JavaScript:
You can save this code in an HTML file, and when you open it in a web browser, it will show you the game. Use the arrow keys on your keyboard to control the blue cube. The goal is to eat all the black cubes while avoiding the red cubes. If you eat a black cube, you will increase in size and speed. If you collide with a red cube and you're bigger, you can eat it, but if you're smaller or equal in size, it's game over. Once you eat all 200 black cubes, a message will be displayed saying "Congratulations! You won!"